Imaging apparatus and method for controlling the same
a technology of an imaging apparatus and a control device, which is applied in the direction of cameras, television systems, instruments, etc., can solve the problems of electric power consumption, and achieve the effect of reducing the release time lag in an ordinary shooting operation
Inactive Publication Date: 2009-12-29
CANON KK
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Benefits of technology
The present invention is about an imaging apparatus that reduces release time lag when switching between live view and hybrid shutter shooting modes. It achieves this by not supplying power to a second-curtain holding electromagnet when in live view mode. The invention also includes a shutter device with two cam gears that simultaneously drive the first and second curtain blade groups, as well as a mirror driving member that can be displaced to different positions. The second cam gear drives the mirror for both up and down operations. The technical effect of this invention is to reduce the time it takes to switch between modes and improve the overall performance of the imaging apparatus.
Problems solved by technology
In other words, the imaging apparatus continuously supplies electric power to the second-curtain holding electromagnet and, as a result, continuously consumes electric power.
Furthermore, an imaging apparatus equipped with the shutter device discussed in Japanese Patent Application Laid-Open No. 11-194394 does not supply electric power to the second-curtain holding electromagnet when the imaging apparatus operates in the live view function mode.
However, Japanese Patent Application Laid-Open No. 11-194394 mentions nothing about a desired relationship between a mirror driving mechanism and a shutter driving mechanism to reduce the release time lag when the operation mode of an imaging apparatus is switched from the live view function mode to the hybrid shutter shooting mode.
Method used
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[0034]The following description of exemplary embodiments is illustrative in nature and is in no way intended to limit the invention, its application, or uses. It is noted that throughout the specification, similar reference numerals and letters refer to similar items in the following figures, and thus once an item is described in one figure, it may not be discussed for following figures. Exemplary embodiments will be described in detail below with reference to the drawings.
[0035]Exemplary embodiments may designate numerical values indicating size (dimensions), shape, and position of constituent components although the values can be appropriately changed according to each apparatus to which the present invention is applied or according to various conditions. The present invention is not limited to exemplary embodiments described below.
[0036]FIG. 1 illustrates a perspective front view of an imaging apparatus according to an exemplary embodiment of the present invention. FIG. 2 illustr...
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A first cam gear (a shutter cam gear) and a second cam gear (a mirror cam gear) are driven to successively realize a first phase (a stop phase), a second phase (a live view phase), and a third phase (a shooting phase).
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a shutter device and an imaging apparatus including a shutter device.[0003]2. Description of the Related Art[0004]An imaging apparatus includes a viewfinder that enables a user to confirm an image of an object captured by an image sensor. The operation by an imaging apparatus that displays an object image on a liquid crystal display (LCD) device or a comparable monitor is generally referred to as “live view” function. The following is a shutter device used in a conventional imaging apparatus.[0005]A conventional shutter device includes two arms configured to form a parallel link mechanism capable of rotatably holding a plurality of blade groups. The shutter device includes a first-curtain blade group and a second-curtain blade group mounted on a shutter ground plate. In an exposure operation, the first-curtain blade group increases an aperture of the shutter from a closed state to an ope...
Claims
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IPC IPC(8): G03B9/02G03B9/00G03B9/08H04N5/238H04N23/75
CPCG03B9/32
InventorSAKAI, MASANORIINUKAI, HIROAKI
OwnerCANON KK